Lower tumbler for dredges and the like.



PATBNTED JULY 17, y1906.

Noi 826,514.

S. L. G. KNOX.

LOWER 'IUMBLBR'FR DREDGES AND THE LIKE.

APPLICATION PILBDSEPT. 20. 1905.

UNITIED STATES PATENT OFFIOE.

SAMUEL Lrrrnvoorr Gnrswonn KNOX, or MILWAUKEE, iviscON'siN,i, Y A ssrGNOR TOTHE Vcuernos[cot/imma OF SOUTH MILWAUKEE,

Wisconsin CORPORATION or wisconsin.-

LowEuMBu-:R Fon DRE-megacamp THE'UKE. l

N6: 52e, k5114.

, certainnew and .useful Improvements in,

Lower Tumblers for Dredges and the Like; and' I do hereb' declare the followingto be aulL-clear, an exactdescriptiono the inio ventiolnvsuch as will enable others skilled in ,use the same. l

the art to Whichit appertains to make and This invention relatesfto dredging apparas tus,v and articularly to' the lower tumblers j over whic the ,chain ,with the dredging-buckf etspass'es." v

. `ordinarily constructed, the lower tum-- blers referred to have been polygonal in shape, the flat eripheral faces terminating ao at their lines ci) intersection with adjacent faces. Where the buckets extend to a considerable extent over the rear or trailing edge of the faces, and this is usually the case in dredging apparatus, the drag of a following upon a. preceding bucket tends to break the aback of the preceding bucket across the edge formed at the intersection of two adjacent faces as the buckets 'pass successively over the tumbler. While this tendency does not rdinarily result in an actual breakin in two of the bucket, yet the, Wearing to the uckets upon the edge soon wears holes in the backs o theA buckets. This wearing action is increased by the hard character of the mateployed at the junctions of thefaces to prevent their wearing away.`

' The object oi the invention is to prevent the buckets from drawing across the edges of `the peripheral faces of the tumbler, as has beendescribed, thereby doing away with the tendency to break the bucket andv also with the'wearing otholes in the bucket-backs, as has been mentioned. This is accomplished by providing a projection at an edge of each face of the tumbler, which projection overhangs an adjacent face.

\ A further object of the invention is to pro nvidenimproved construction of tumbler, as 5o. will be hereinafter set forth.

j Specification of Lettersuatent. vApplication led September 20,1905. Serial No. 279.368.

rial, usually manganese steel, which is em- The invention can behest explained in connection with the accompanying,.dravvings,` of which g 1 i u p Figure 1 is a plan view offa tumbler embodying the invention with .a portion of the chain in dotted lines sucieift to show its relation to the tumbler, and llig.- 2 isa section LAof a tumbler with flangel omitted on the line' a b of Fig. 1 looking in the direction of the arl row. A portion of a bucket-chain is applied thereto, and certain portions of. the `chain are.

shown by dotted lines.

Upon a suitable shaft ,A -is v.mounted a spider B, of suitable construction. `This f spider is shown as keyed to the shaft, while the shaftinay be mounted in any suitable bearings. Upon the periphery ofthe spider are formed a plurality of plane faces'C, each of which has a projection D Afrom its trailing edge which overhangs an adjacent face. The 7o direction of rotation of the tumbler is indicated by the arrow in Fig. 2l

Each of the faces C may comprise two elements 1 and 2, which are axially and oppositely inclined, so as to form a wedge-shaped face, and thus an opening 3 is provided be tween the elements at their diverging ends 4 5 at thewide end of the surface, so that the converging .ends 6 7 of the elements of an adjacent face (and the narrow end of the corresponding face) may pass throughthe opening 3. The converging ends 6 7 extend beyond the surface of the adjacent face, so that the overhangin projection D is formed as before describe At the sides of the tumbler are' provided iianges 8 9 t'o guide the chain upon the tumbler, as is well understood. The chain comprises a plurality of links 10, each comprising a bucket 11, of suitable form. The chain may be, for instance, constructed as shown in the patent to me granted May 16, 1905, No. 790,211. c Reference to this patent will show that at one end of the link is a double eye, while at the other is a single eye, and the various links are adapt-A 9 54 ed to be connected together` by inserting a sin le eye of one link between the double eyes of t e other link and then inserting a in. In the 'usual construction of, lower tum ler before referred to the back 12 of a bucket would `roo rateneeatuiy i7, e.

tend to become broken across the line 13 and wear of the bucket, as before adverted to, would ,be occasioned.l The projection D, however, on the edge of each face supports the drag of a succeedinglink upon its preceding one, and thereby does away with the objectionable consequences noted.

By reference to Fig. l itl will be seen that the end of the link having the single eye 14 is supported by the projection D, composed in this ycase of the ends 6 7 of the surface elements, while the double eye 15 of the succeedin link straddles that projection, suflicient c earance being provided on both sides to accommodate the double eye.

The spider B is usually of cast-iron, and to increase the wearing qualities the faces C are generallyformed by securing plates 16 of manganese steel to the spider by riveting, as shown, or other suitable means.

While the invention has been illustrated in what isconsidered its'best application, it is t0 be understood that it may be embodied lin other constructions and should not, therefore, be limited to that shown.

Having thus described the invention, what I claim as new, and desire to secure by-Letters Patent, is-

1. The combination with a bucket-chain,

of a tumbler -at the lower Vend thereof, having a plurality of peripheralfaces, each of said beyond the broad end 4of lan adjacent face. 45

5. A tumbler having a plurality ofI peri h- 5, 'l eral wedge-shaped faces, the narrow en of 'one face entering an opening inthe broad end @y of an adjacent face and projecting lbeyond the surface of the last-mentioned face.

6. A tumbler having a plurality of peripheral faces, each comprising two oppositely axially inclined elements,l the convergin ends of said elements ,passing between an projectingbeyond thediverging ends of the 55 i elements ofan adjacent face. j v

In testimony whereof I have affixed my signature in presence. of two witnesses'.

SAMUEL LIPPINCOTT GRISWOLD KNOX. Witnesses: 'j

RIDGELY FLETCHER. 'HARRYB HAvrmN. 

